Cameras captured the Ottawa Senators captain dancing and clapping along with the crowd at Landsdowne Park while sitting on the bench during a third-period stoppage in play.
Karlsson may have been keeping it loose during breaks, but he did serious work against the Montreal Canadiens. The Senators defenseman was named the game's No. 1 star after scoring an assist and leading all skaters with 32:55 of ice time in the Senators 3-0 win.
It all added up to a for a fun night for Karlsson and Ottawa.